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- W2042127788 abstract "In this paper we report a novel hydrogel functionalized optical Fiber Bragg Grating (FBG) sensor based on chemo-mechanical- optical sensing, and demonstrate its specific application in pH activated process monitoring. The sensing mechanism is based on the stress due to ion diffusion and polymer phase transition which produce strain in the FBG. This results in shift in the Bragg wavelength which is detected by an interrogator system. A simple dip coating method to coat a thin layer of hydrogel on the FBG has been established. The gel consists of sodium alginate and calcium chloride. Gel formation is observed in real-time by continuously monitoring the Bragg wavelength shift. We have demonstrated pH sensing in the range of pH of 2 to 10. Another interesting phenomenon is observed by swelling and deswelling of FBG functionalized with hydrogel by a sequence of alternate dipping between acidic and base solutions. It is observed that the Bragg wavelength undergoes reversible and repeatable pH dependent switching." @default.
- W2042127788 created "2016-06-24" @default.
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- W2042127788 date "2013-04-12" @default.
- W2042127788 modified "2023-09-23" @default.
- W2042127788 title "pH induced switching in hydrogel coated fiber Bragg grating sensor" @default.
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- W2042127788 doi "https://doi.org/10.1117/12.2009620" @default.
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